KR20190029987A - Touch sensitive device and display device including the same - Google Patents

Abstract

According to one embodiment of the present invention, a display device comprises: a display panel including a display region with a bending region; a first touch sensitive device overlapping the display region of the display panel and including a first electroactive layer; a bending member disposed under the display panel and overlapping at least the bending region; and a second touch sensitive device including a second electroactive layer covering the bending member. Therefore, the lifetime and driving stability of the first and second touch sensitive devices may be improved in the bending region where stress due to bending is concentrated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a touch sensing device and a display device including the touch sensing device.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a touch sensing device and a display device including the touch sensing device, and more particularly, to a touch sensing device which increases resistance to deformation in a bending area, ≪ / RTI >

The touch panel is a device for detecting a user's touch input such as a screen touch or a gesture on a display device, and is used for a portable display device such as a smart phone or a tablet PC, a display device of a public facility, Devices. Examples of the operation method of the touch panel include a resistive method, a capcitive method, an optical method, and an electro-magnetic (EM) method.

However, in recent years, in addition to sensing a user's touch input, a haptic device, which is a touch sensitive device that transmits tactile feedback that can be felt by a user's finger or a user's stylus pen with feedback on a user's touch input, ) Devices are under study.

Haptic devices using Electro Active Polymer (EAP) have been studied as a haptic device. Since the haptic device using the electroactive polymer is thin and flexible, it can be easily applied to various display devices. However, in the haptic device using the electroactive polymer applied to the flexible display, the stress is concentrated in the bending region where the bending is repeatedly repeated, and the lifetime and driving stability of the haptic device using the electroactive polymer are lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a contact-sensitive device which improves the lifetime and driving stability of a contact-sensitive device at a stress concentration region due to bending, and a display device including the same.

Another problem to be solved by the present invention is to provide a contact-sensitive element having excellent vibration characteristics even in repetitive bending and a display device including the same.

Another problem to be solved by the present invention is to provide a contact-sensitive element and a display device including the contact-sensitive element that can directly function as a bending member such as a hinge when being applied to a flexible display device .

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a display device including a display panel including a display region having a bending region, a display region overlapping a display region of the display panel, And a second contact sensing element disposed below the display panel and including at least a bending member overlapping the bending region and a second electroactive layer covering the bending member. Therefore, the lifetime and the driving stability of the first touch sensing device and the second touch sensing device can be improved in the bending area where stress due to bending is concentrated.

According to another aspect of the present invention, there is provided a display device including a display panel including a display region having a bending region, a first contact sensing element overlapping the display region, And a second contact-sensitive element disposed in correspondence with the first contact-sensitive element and including a hollow-tube-shaped bending member made of an electroactive polymer. Therefore, the bending member can be formed as a contact-sensitive element, so that the manufacturing process and the configuration can be simplified.

The details of other embodiments are included in the detailed description and drawings.

According to the present invention, it is possible to secure the stable vibration characteristics of the contact-sensitive element by thickening the electroactive layer at the stress concentration region due to bending and dispersing the load.

The present invention simplifies the process for forming the electrodes of the contact-sensitive element and minimizes the reliability reduction of the contact-sensitive elements due to repetitive bending.

The present invention can simplify the process of disposing the bending member and provide additional vibration function in the bending region since the contact sensitive device can function as a bending member that facilitates bending of the display device.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a cross-sectional view of a display device according to an embodiment of the present invention.
2 is a cross-sectional view of a display device according to another embodiment of the present invention.
3 is a cross-sectional view of a display device according to another embodiment of the present invention.
4 is a cross-sectional view of a display device according to another embodiment of the present invention.
5 is a cross-sectional view of a display device according to another embodiment of the present invention.
6 is a cross-sectional view of a display device according to another embodiment of the present invention.
7 is a cross-sectional view of a display device according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Where the terms "comprises", "having", "done", and the like are used in this specification, other portions may be added unless "only" is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

It will be understood that when an element or layer is referred to as being on another element or layer, it encompasses the case where it is directly on or intervening another element or intervening another element or element.

Although the first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

Like reference numerals refer to like elements throughout the specification.

The sizes and thicknesses of the individual components shown in the figures are shown for convenience of explanation and the present invention is not necessarily limited to the size and thickness of the components shown.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other partially or entirely and technically various interlocking and driving is possible as will be appreciated by those skilled in the art, It may be possible to cooperate with each other in association.

Various embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a display device according to an embodiment of the present invention. Referring to FIG. 1, a display device 100 according to an exemplary embodiment of the present invention includes a display panel 110, a bending member, a first contact sensing device 120, and a second contact sensing device 130.

The display panel 110 is a structure for displaying an image. The display panel 110 may be provided with display devices for displaying an image on a substrate and various circuits for driving the display device. For example, when the display device 100 according to an embodiment of the present invention is an organic light emitting display, the display panel 110 may include a substrate, a thin film transistor on a substrate, a wiring, an organic light emitting diode, . However, the present invention is not limited thereto, and various types of display panels may be used for the display panel 110. [

The display panel 110 includes a display area AA and a non-display area. The display area AA is an area for displaying an image, and a circuit, components, and the like for driving the display element and the display element are arranged. In FIG. 1, for convenience of description, the display panel 110 is simplified to show only the display area AA.

The display area AA includes a bending area BA. The bending area BA is an area where the display device 100 can bend. Therefore, the display device 100 according to an embodiment of the present invention can be implemented as a Ben Double display device or a foldable display device. On the other hand, the bending area BA is bent repeatedly, and the stresses concentrate on various parts and wirings disposed in the bending area BA, so that the structures disposed in the bending area BA may be damaged.

Although not shown in FIG. 1 for convenience of explanation, the non-display area is an area where no image is displayed, and a circuit, parts, and the like for driving the display element of the display area AA are disposed. The non-display area may extend in the display area AA, or may be an area arranged to surround the display area AA.

A first touch sensing device 120 is disposed under the display panel 110. The first touch sensing element 120 is an element that transmits tactile feedback to the touch input of the user. For example, when the touch input of the user to a specific point is sensed, the first touch sensing element 120 may cause vibration to occur at a specific point. Although the first touch sensing device 120 is illustrated as being disposed below the display panel 110 in FIG. 1, the first touch sensing device 120 may be disposed on top of the display panel 110 have.

The first touch sensing element 120 includes a first electroactive layer 121, a plurality of first electrodes 122, and a plurality of second electrodes 123.

The first electroactive layer 121 is made of an electroactive polymer. The first electroactive layer 121 may be a film made of an electroactive polymer that is a polymer material that is deformed by electrical stimulation. When an electric field is applied to the first electroactive layer 121, the alignment direction of the dipole in the electroactive polymer forming the first electroactive layer 121 is changed, and the electrostatic attractive force or The first electroactive layer 121 is vibrated by the repulsive force.

The first electroactive layer 121 may be made of PVDF polymer. For example, the first electroactive layer 121 may be made of a PVDF copolymer such as PVDF-TrFE or a PVDF terpolymer such as PVDF-TrFE-CFE, PVDF-TrFE-CTFE and the like. PVDF duplexes and PVDF terpolymers are ferroelectric polymers or relaxed ferroelectric polymers that have the advantage of generating large vibrations even at low drive voltages. In addition, since PVDF duplexes and PVDF terpolymers are randomly bonded to PVDF, TrFE is naturally randomly bonded to the beta-phase (beta-phase) due to the electronegativity difference between the hydrogen (H) atom and the fluorine (F) phase. Unlike the PVDF homopolymer, there is no need of polling to form the? -Phase, and the manufacturing process of the first contact sensing element 120 is simplified, and the manufacturing cost is reduced.

The plurality of first electrodes 122 and the plurality of second electrodes 123 are disposed on the upper surface and the lower surface of the first electroactive layer 121, respectively. The first electrode 122 and the second electrode 123 are electrodes for applying a voltage to the first electroactive layer 121, and are made of a conductive material.

In order to secure the transmittance of the first touch sensing device 120, when the first touch sensing device 120 is disposed on the display panel 110, the first and second electrodes 122 and 123 ) May be made of a transparent conductive material. For example, the first electrode 122 and the second electrode 123 may be formed of a transparent material such as indium tin oxide (ITO), aluminum doped zinc oxide (AZO), fluorine tin oxide (FTO), silver- And may be made of a conductive material.

In addition, the first electrode 122 and the second electrode 123 may be formed of a metal mesh. That is, the first electrode 122 and the second electrode 123 are formed of a metal mesh in which metal materials are arranged in a mesh shape, so that the first electrode 122 and the second electrode 123 function as substantially transparent electrodes You may. The materials of the first electrode 122 and the second electrode 123 are not limited to those described above and various transparent conductive materials may be used as the material of the first electrode 122 and the second electrode 123 . The first electrode 122 and the second electrode 123 may be formed of the same material or different materials.

The plurality of first electrodes 122 and the plurality of second electrodes 123 may be formed in various ways. For example, the plurality of first electrodes 122 and the plurality of second electrodes 123 may be formed on the first electroactive layer 121 in such a manner as sputtering, printing, slit coating, .

The plurality of first electrodes 122 and the plurality of second electrodes 123 may be arranged in various forms as needed. For example, a plurality of first electrodes 122 may be disposed on the upper surface of the first electroactive layer 121, and a plurality of second electrodes 123 may be disposed on the lower surface of the first electroactive layer 121. The first electrode 122 disposed on the upper surface of the first electroactive layer 121 extends in the X axis direction and the second electrode 123 disposed on the lower surface of the first electroactive layer 121 extends in the Y direction And the first contact sensing element 120 can be driven by a vertical electric field between the plurality of first electrodes 122 and the plurality of second electrodes 123. In addition, The plurality of first electrodes 122 and the plurality of second electrodes 123 are all disposed on only one side of the first electroactive layer 121 and the plurality of first electrodes 122 and the plurality of second electrodes 123 The first touch sensing element 120 can be driven by a horizontal electric field between the first touch sensing element 120 and the second touch sensing element 120. [ 1, a plurality of first electrodes 122 on the upper surface of the first electroactive layer 121 and a plurality of second electrodes 123 on the lower surface are arranged so as to face each other, The first touch sensing device 120 can be driven independently. In this case, the horizontal electric field between the plurality of first electrodes 122, the horizontal electric field between the plurality of second electrodes 123, and / or the vertical electric field between the plurality of first electrodes 122 and the plurality of second electrodes 123 The first touch sensing element 120 can be driven. 1, the first touch sensing device 120 is disposed on a lower surface of the first electrode 122 and the first electroactive layer 121 located on the upper surface of the first electroactive layer 121, And a plurality of second electrodes 123 will be described.

1, the first touch sensing device 120 includes a plurality of first electrodes 122 on a top surface of a first electroactive layer 121 and a plurality of second electrodes 122 on a bottom surface of the first electroactive layer 121 123). In order to form an electric field in the first electroactive layer 121, voltages of different magnitudes are applied to the plurality of first electrodes 122 and the plurality of second electrodes 123, or a voltage having opposite electrical characteristics . At this time, various electric fields can be formed by applying a voltage to the plurality of first electrodes 122 and the plurality of second electrodes 123 in various combinations. Accordingly, the first touch sensing device 120 can be driven variously to transmit a variety of direct tactile sensations to the user.

An insulating layer 151 is disposed under the first touch sensing element 120. The insulating layer 151 is a structure for insulating the first contact sensing element 210 and the second contact sensing element 130 disposed under the first contact sensing element 120.

A bending member including a columnar portion 141 is disposed under the insulating layer 151. [ The bending member is disposed so as to overlap the bending area BA of the display panel 110. The bending area BA of the display panel 110 can be bent around the bending member and the bending member can support the display panel 110 to be bent. For example, the bending member may have various structures that facilitate the bending of the display panel 110, such as a hinge, a support, and the like, and support the display panel 110 when bending. In the following description, the bending member is a hinge for convenience of explanation, but the present invention is not limited thereto.

The bending member includes the pillar portion 141. The post 141 may be disposed at the center of the bending area BA. Therefore, the display panel 110 can be bent around the pillar portion 141. The post 141 functions as a bending axis when bending the display panel 110 and can also function as a support for supporting the display panel 110. [ Accordingly, the display panel 110 can be bent or folded about the column portion 141. [

The pillars 141 may be made of an insulating material. For example, the post 141 may be made of an insulating material such as plastic, and if it is a material that can easily adhere to the second touch sensing element 130 and can support the display panel 110 at the time of bending, The material of the portion 141 is not limited.

The second touch sensing element 130 is disposed so as to cover the column portion 141. The second touch sensing element 130 includes a second electroactive layer 131, a third electrode 132, and a fourth electrode 133.

The second electroactive layer 131 is made of an electroactive polymer. When an electric field is applied to the second electroactive layer 131, the alignment direction of the dipole in the electroactive polymer constituting the second electroactive layer 131 is changed, and the electroactive attraction or repulsion force of the second electroactive layer 131 131 are vibrated. The second electroactive layer 131 may be formed of the same material as that of the first electroactive layer 121 of the first contact sensing element 120 described above.

The third electrode 132 and the fourth electrode 133 are disposed on both surfaces of the second electroactive layer 131, respectively. The third electrode 132 and the fourth electrode 133 are electrodes for applying a voltage to the second electroactive layer 131 and are made of a conductive material. The third electrode 132 and the fourth electrode 133 are substantially the same as the first electrode 122 and the second electrode 123 of the first contact sensing element 120, , So redundant description will be omitted.

Since the second touch sensing element 130 is disposed to cover the columnar section 141, it can be formed in a semicircular shape. For example, the third electrode 132, which is disposed so as to surround the column 141, is disposed so as to surround a part of the outer periphery of the column 141. The second electroactive layer 131 is disposed so as to surround the outer circumferential surface of the third electrode 132. Finally, the fourth electrode 133 is disposed so as to surround the outer peripheral surface of the second electroactive layer 131.

When the second contact sensing element 130 is formed as shown in FIG. 1, the columnar section 141 is disposed on the insulating layer 151, and then the third electrode 132 and the second electroactive layer 131 And the fourth electrode 133 may be sequentially formed.

However, the present invention is not limited thereto. Alternatively, after the second contact sensing element 130 is separately formed on the columnar section 141, the columnar section 141 surrounded by the second contact sensing element 130 may be attached on the insulating layer have. That is, the third electrode 132, the second electroactive layer 131, and the fourth electrode 133 may be sequentially formed in a state where the columnar portion 141 is separately disposed. In this case, the second touch sensing element 130 is disposed so as to completely surround the column portion 141, and the entire second touch sensing element 130 may be formed in a columnar shape surrounding the column portion 141. Therefore, only the fourth electrode 133 of the second touch sensing element 130 and the pillar portion 141 of the second touch sensing element 130 may be in contact with the insulating layer.

In addition, since the second touch sensing element 130 is additionally disposed along the column 141, a difference in vibration acceleration may occur between regions except the bending region BA and the bending region BA. That is, the bending area BA may be subjected to additional vibration more than other areas, so that the bending area BA may have higher vibration acceleration than the other areas. However, in the display device 100 according to the embodiment of the present invention, the first contact sensing device 120 and the second contact sensing device 130 in the circuit for driving the first contact sensing device 120 and the second contact sensing device 130, It is possible to prevent the vibration acceleration from being excessively increased in the bending area BA by adjusting the signal applied to the sensitive element 130 and applying the compensation signal.

Although not shown in FIG. 1, the display device 100 may further include a touch panel capable of measuring a touch input position of a user and / or a magnitude of a touch pressure. The touch panel may be positioned between the display panel 110 and the first touch sensing device 120 or on the display panel 110, and the specific configuration of the touch panel is not limited.

The contact sensitive device using the electroactive polymer among the contact sensitive devices is thin and flexible, so that it can be applied to various display devices. Particularly, among the display devices, a contact-sensitive device using an electroactive polymer can be applied to a flexible display device in which a display device is bended or collapsed. However, the flexible display includes a flexible bending area that can bend or fold, where the bending area is stressed due to repetitive bending. These stresses impair the contact-sensitive elements disposed in the bending region, reduce the lifetime and drive stability of the contact-sensitive elements in the bending region, and reduce the vibration characteristics.

The display device 100 according to an embodiment of the present invention further includes a second touch sensing device 130 disposed in the bending area BA in addition to the first touch sensing device 120 disposed in the display area AA do. Specifically, the second touch sensing element 130 may be disposed so as to cover the pillar 141, which is a bending member for assisting the bending of the display apparatus 100. [ Therefore, even if the first touch sensing element 120 is damaged due to stress concentration in the bending area BA or the vibration characteristic is reduced, the second touch sensing element 130 is further disposed, ) Can be dispersed. Further, even if the vibration characteristic of the first touch sensing element 120 is reduced, the second touch sensing element 130 can reinforce the vibration characteristic. In addition, the second touch sensing element 130 arranged to correspond to the bending area BA may vibrate to give an additional vibration effect in the bending area BA. Therefore, the display device 100 according to an embodiment of the present invention may further include the second touch sensing device 130 in the bending area BA to disperse the stress concentrated on the first touch sensing device 120, 1 damage to the contact sensing element 120 can be minimized, stable vibration characteristics can be ensured, and an additional vibration effect in the bending area BA can be further provided.

Hereinafter, the effects of the display device 100 according to an embodiment of the present invention will be described in more detail with reference to Table 1.

Bending times Comparative Example Example 5,000 times 0.6 G 0.8 G 10,000 times 0.5 G 0.8 G 15,000 times 0.5 G 0.7 G 20,000 times 0.3 G 0.7 G 25,000 times 0.2 G 0.7 G 30,000 times 0.2 G 0.7 G

In the above Table 1, the embodiment shows the vibration acceleration in the bending area BA according to the number of times of bending in the display device 100 according to the embodiment of the present invention described above with reference to FIG. 1, The vibration acceleration in the bending region according to the number of bending times when the second contact sensing element 130 is removed from the display device 100 according to an embodiment of the present invention.

Referring to Table 1, in the embodiment, since the second contact sensing element 130 is disposed in the bending area BA, the initial vibration acceleration is higher than that of the comparative example. However, in the case of the embodiment, even if the number of bending times is 30,000, the reduction amount of the vibration acceleration is only 0.1 G, whereas in the case of the comparative example, the vibration acceleration decreases sharply as the number of bending increases, G.

Thus, it can be seen that the display device 100 according to the embodiment of the present invention can provide a more stable vibration characteristic in the bending area BA as compared with the comparative example.

2 is a cross-sectional view of a display device according to another embodiment of the present invention. The display device 200 of FIG. 2 differs from the display device 100 of FIG. 1 only in the material of the pillar portion 241 which is a bending member and the electrode arrangement of the second contact- Since the configuration is substantially the same, a duplicate description will be omitted.

Referring to FIG. 2, the columnar portion 241, which is a bending member, is made of a conductive material. The pillar portion 241 made of a conductive material not only helps bend the display device 200 but also functions as an electrode of the second touch sensing device 230 arranged to cover the pillar portion 241 .

The second touch sensing element 230 includes a fourth electrode 133 disposed to cover the columnar section 241 and disposed to cover the second electroactive layer 131 and the second electroactive layer 131. Since the columnar portion 241 contacting the one surface of the second electroactive layer 131 is a conductive material, the columnar portion 241 can be utilized as an electrode of the second touch sensitive element 230. [ The second touch sensing element 230 may be driven by a columnar portion 241 disposed on one surface of the second electroactive layer 131 and a fourth electrode 133 disposed on the other surface.

The display device 200 according to another embodiment of the present invention may be configured such that the pillar portion 241 which is a bending member is made of a conductive material and therefore the electrode of the second touch sensing device 230 disposed to surround the pillar portion 241 The columnar section 241 can be utilized. Accordingly, since the display device 200 according to another embodiment of the present invention can utilize the bending member as the electrode of the second touch sensing device 230, a process for forming the electrode of the second touch sensing device 230 And the structure of the display device 200 can be further simplified.

3 is a cross-sectional view of a display device according to another embodiment of the present invention. The display device 300 of FIG. 3 differs from the display device 100 of FIG. 1 only in the structure of the bending member 340 and the second contact-sensitive element 330, but the other structures are substantially the same Duplicate description will be omitted.

Referring to FIG. 3, the bending member 340 includes a post 141 and a support 342. The columnar section 141 is disposed at the center of the bending area BA and the support section 342 is disposed at both sides of the column section 141 to support at least the entire area of the display area AA. The support portion 342 can be rotated about the post 141. The display panel 110 supported by the support portion 342 may be bent or folded together to rotate together with the rotation of the support portion 342.

The bending member 340 may be made of an insulating material. That is, both the column portion 141 and the support portion 342 may be made of an insulating material such as plastic. Since the bending member 340 is made of an insulating material, the insulating layer 151 described above can be omitted.

The second touch sensing element 330 is disposed so as to cover the bending member 340. The second contact sensing element 330 is arranged to cover the whole of the columnar portion 141 and the support portion 342 of the bending member 340 at the lower portion of the bending member 340. [ The second touch sensing device 330 may be disposed on the entire area of the display panel 110, such as the bending member 340.

The second touch sensing element 330 includes a second electroactive layer 331, a plurality of third electrodes 332 and a plurality of fourth electrodes 333. First, a plurality of third electrodes 332 are disposed on the lower surface of the bending member 340, a second electroactive layer 331 is disposed on the lower surface of the plurality of third electrodes 332, and a second electroactive layer 331 And a plurality of fourth electrodes 333 are disposed on the lower surface of the first electrode 333. Each of the plurality of fourth electrodes 333 may correspond to each of the plurality of third electrodes 332. The plurality of third electrodes 332 and the plurality of fourth electrodes 333 may be substantially the same as the first and second electrodes 122 and 123 of the first touch sensing device 120, .

At this time, the first touch sensing device 120 and the second touch sensing device 330 may be driven individually or simultaneously.

For example, when the first touch sensitive device 120 and the second touch sensitive device 330 are individually driven, the first electrode 122 and the second electrode 123 of the first touch sensing device 120 are driven, Different wires may be connected to the third electrode 332 and the fourth electrode 333 of the second touch sensing device 330 to apply different voltages to each other. If a voltage is applied only to the first electrode 122 and the second electrode 123 and no voltage is applied to the third electrode 332 and the fourth electrode 333 or vice versa, The element 120 and the second contact sensitive element 33 can be driven separately.

When the first contact sensing element 120 and the second contact sensing element 330 are simultaneously driven, the first electrode 122, the third electrode 332, the second electrode 123, It is possible to simultaneously drive the first contact sensing device 120 and the second contact sensing device 330 by applying the same voltage to the four electrodes 333 at the same time. Alternatively, the same wire is connected to the first electrode 122 and the third electrode 332 disposed at positions corresponding to each other, and a voltage is applied at the same time, and the second electrode 123 and the fourth electrode It is possible to connect the same wiring to the electrode 333 and apply the voltage at the same time. In this case, since the first electrode 122 and the third electrode 332, the second electrode 123 and the fourth electrode 333 share the same wiring, the structure of the wiring can be simplified and the width of the bezel region Can be reduced. The same wiring is connected to the first electrode 122 and the fourth electrode 333 disposed at positions corresponding to each other, and the second electrode 123 and the third electrode 332, which are disposed at positions corresponding to each other, The first contact sensitive device 120 and the second contact sensitive device 330 can be driven by connecting the same wirings. In this case as well, the structure of the wirings can be simplified and the width of the bezel area can be reduced have.

The second contact sensing element 330 may include only the second electroactive layer 331 and the fourth electrode 333, but may be formed of a material other than the material of the first electrode 331. [ . In this case, the second touch sensing element 330 may be implemented in such a manner that the second electroactive layer 331 is vibrated by the transverse electric field formed by using the fourth electrode 333. [

The display device 300 according to another embodiment of the present invention may be configured such that the columnar portion 141 and the support portion 342 of the bending member 340 support at least the entire area of the display area AA of the display panel 110 . The second contact sensing element 330 is also disposed to cover the entire bending member 340 along the shape of the bending member 340. Therefore, the second touch sensing element 330 can also overlap with the display area AA of the display panel 110 like the bending member 340, and the first touch sensitive element 330, which is disposed over the entire area of the display panel 110, Can also be overlapped with the entire area of the substrate 120. Therefore, since not only the first touch sensing element 120 but also the second touch sensing element 330 are disposed in the entire area of the display panel 110, degradation in vibration characteristics due to repetitive bending and folding in the bending area BA can be suppressed It is possible to provide a stronger vibration acceleration in the entire area of the display panel 110 with the effect of preventing the display panel 110 from being damaged.

4 is a cross-sectional view of a display device according to another embodiment of the present invention. The display device 400 of FIG. 4 differs from the display device 300 of FIG. 3 only in the material of the bending member 440 and the electrode arrangement of the second touch sensing element 430, Therefore, redundant description will be omitted.

Referring to FIG. 4, the bending member 440 is made of a conductive material. That is, both the pillar portion 441 and the support portion 442 of the bending member 440 may be made of a conductive material. Since the bending member 440 is made of a conductive material, the insulating layer 151 is disposed between the bending member 440 and the first contact sensing element 120. The insulating layer 151 may be formed on the insulating layer 151 in order to prevent the reliability of the first contact sensing element 120 from being reduced by the bending member 440 made of a conductive material when the first contact sensing element 120 is driven, And is disposed between the second electrode 123 of the sensitive element 120 and the bending member 440.

The bending member 440 of the conductive material contacts the upper surface of the second electroactive layer 331 of the second touch sensing element 430. In the second touch sensing element 430, only a plurality of fourth electrodes 333 are disposed on the lower surface of the second electroactive layer 331. Accordingly, the bending member 440 made of a conductive material can function as an electrode of the second touch sensing element 430 together with the plurality of fourth electrodes 333. [ In this case, it is possible to drive the second touch sensing element 430 in units of cells by applying different voltages to each of the plurality of fourth electrodes 333 in a state where a specific voltage is applied to the bending member 440 .

The bending member 440 of the conductive material in the display device 400 according to another embodiment of the present invention may also be used as an electrode of the second touch sensing device 430. [ That is, the bending member 440 of the conductive material in contact with the second touch sensing element 430 functions as the bending member 440, but may also function as the electrode of the second touch sensing element 430 at the same time. The bending member 440 may be used as an electrode of the second touch sensing device 430 so that the electrode of the second touch sensing device 430 is formed in the display device 400 according to another embodiment of the present invention. The process for the display device 200 can be simplified, and the structure of the display device 200 can be further simplified.

5 is a cross-sectional view of a display device according to another embodiment of the present invention. The display device 500 of FIG. 5 differs from the display device 400 of FIG. 4 only in that the electrode arrangement of the first touch sensing element 520 is different and the insulating layer 151 is omitted. Are substantially the same as each other, so redundant explanations will be omitted.

5, the bending member 440 of the conductive material contacts the lower surface of the first electroactive layer 121 of the first touch sensing element 520 and contacts the second electroactive layer 331 of the second touch sensitive element 430 Respectively. In addition, only the plurality of first electrodes 122 on the upper surface of the first electroactive layer 121 are disposed in the first touch sensing element 520. In addition, only the plurality of fourth electrodes 333 on the bottom surface of the second electroactive layer 331 are disposed in the second touch sensing element 430. The bending member 440 made of a conductive material can simultaneously function as the electrodes of the first contact sensing device 520 and the second contact sensing device 430.

When the bending member 440 is simultaneously used as the electrodes of the first contact sensing element 520 and the second contact sensing element 430, the first contact sensing element 520 and the second contact sensing element 430 may be individually Respectively.

A voltage is applied to a bending member 440 functioning as an electrode of the first contact sensing element 520 and the second contact sensing element 430 at the same time, When a voltage is applied to the first contact electrode 122 and the plurality of fourth electrodes 333 of the second contact sensitive device 430 by connecting different wirings to the first contact sensitive device 520 and the second contact sensitive device 430, 430 can be selectively driven. At this time, a longitudinal electric field is formed between the plurality of vertically arranged first electrodes 122 and the bending member 440 and between the bending member 440 and the plurality of fourth electrodes 333. Therefore, the first contact sensing element 520 and the second contact sensing element 430 can be individually driven even if the bending member 440 is shared by one electrode.

When the bending member 440 is simultaneously used as the electrodes of the first contact sensing element 520 and the second contact sensing element 430, the first contact sensing element 520 and the second contact sensing element 430, Can be driven as one contact sensitive element.

For example, when a specific voltage is applied to the bending member 440 functioning as the electrodes of the first contact sensing element 520 and the second contact sensing element 430 and the first contact sensing element 520 corresponding to each other, When the same wiring is connected to the plurality of first electrodes 122 of the first touch sensing device 430 and the plurality of fourth electrodes 333 of the second touch sensing device 430 and a voltage different from the voltage applied to the bending member 440 is applied The first contact sensing element 520 and the second contact sensing element 430 can be driven as one contact sensing element.

The bending member 440 of the conductive material in the display device 500 according to another embodiment of the present invention may simultaneously function as the electrodes of the first contact sensitive device 520 and the second contact sensitive device 430. [ In this case, the first contact sensing element 520 and the second contact sensing element 430 are connected to the first electrode 122 and the plurality of fourth electrodes 333, respectively, It is possible to drive them separately. Therefore, the first contact sensing element 520 and the second contact sensing element 430 are driven without forming electrodes on both sides of the first contact sensing element 520 and on both sides of the second contact sensing element 430, can do. The display device 500 according to another embodiment of the present invention uses the bending member 440 simultaneously as the electrodes of the first touch sensing element 520 and the second touch sensing element 430, The process for forming the electrodes of the sensing element 520 and the second touch sensing element 430 can be simplified. In addition, as the electrode arrangement is simplified, the structure of the wiring for applying a voltage to each electrode and the structure of the display device 500 can be simplified.

The same wire is connected to the plurality of first electrodes 122 and the plurality of fourth electrodes 333 of each of the first touch sensing device 520 and the second touch sensing device 430 to apply the same voltage It can be driven at the same time. Therefore, in the display device 500 according to another embodiment of the present invention, the first contact sensing device 520 and the second contact sensing device 430 share the bending member 440 as one electrode, Since the first electrode 122 and the fourth electrode 333 also share the same wiring, the wiring structure can be simplified and the electrode forming process can be simplified.

6 is a cross-sectional view of a display device according to another embodiment of the present invention. The display device 600 of FIG. 6 differs from the display device 300 of FIG. 3 only in the bending member 640 and the second touch sensing device 630, and the other configurations are substantially the same, .

Referring to FIG. 6, the bending member 640 is disposed to overlap with a partial area of the display panel 110. The column portion 141 and the support portion 642 of the bending member 640 are arranged to support only the bending region BA in the display region AA of the display panel 110. [ However, the present invention is not limited thereto, and the bending member 640 may be further disposed in a part of the display area AA other than the bending area BA.

The second touch sensing element 630 arranged to cover the bending member 640 is also arranged to overlap only a part of the display panel 110. [ That is, as shown in FIG. 6, the second touch sensing element 630 is disposed in the bending area BA. However, the present invention is not limited to this, and the second touch sensing element 630 may be further disposed in a part of the display area AA other than the bending area BA.

The bending member 640 in the display device 600 according to another embodiment of the present invention is disposed so as to overlap only a part of the display panel 110, that is, the bending area BA. Since the second contact sensing element 630 is also disposed along the shape of the bending member 640, the second contact sensing element 630 is arranged to overlap only the bending area BA. That is, when the support portion 642 of the bending member 640 is disposed to support only a part of the area including the bending area BA of the display panel 110, the second contact- It can be placed only on a certain area. Therefore, according to the design of the shape or arrangement of the bending member 640, the display device 600 according to another embodiment of the present invention can freely set the design of the second touch sensing element 630, The degree of freedom can be increased.

7 is a cross-sectional view of a display device according to another embodiment of the present invention. The display device 700 of FIG. 7 differs from the display device 100 of FIG. 1 only in that the second contact sensing element 730 itself is formed of a bending member, and the other structures are substantially the same, Is omitted.

Referring to FIG. 7, the second touch sensing device 730 includes a bending member 731, a third electrode 732, and a fourth electrode 733 in the shape of a hollow tube. The second touch sensing element 730 can function as a bending member as well as a vibration effect.

The bending member 731 is composed of an electroactive polymer. Therefore, when a voltage is applied to the bending member 731, the bending member 731 itself can vibrate. Further, the bending member 731 may support the display panel 110 to bend or fold about the bending member 731.

The bending member 731 may have a hollow tube shape. That is, the bending member 731 may be formed in a hollow column shape, but is not limited thereto.

A third electrode 732 is disposed on the inner peripheral surface of the bending member 731 and a fourth electrode 733 is disposed on the outer peripheral surface. Different voltages may be applied to the third electrode 732 and the fourth electrode 733 to form an electric field in the bending member 731 made of an electroactive polymer to give a vibration effect.

An insulating layer 151 is disposed between the first contact sensing element 120 and the second contact sensing element 730. If the insulating layer 151 is not disposed, the second electrode 123 and the fourth electrode 733 are in contact with each other to affect the driving of the first contact sensing element 120 and the second contact sensing element 730 You can give. Therefore, the insulating layer 151 may be disposed for driving the first contact sensing element 120 and the second contact sensing element 730 separately.

The fourth electrode 733 of the second touch sensing element 730 is disposed on the insulating layer 151 for insulation from the first touch sensing element 120. [

7, the third electrode 732 on the inner circumferential surface of the second electroactive layer 731 is shown as a cylindrical shape filled with a conductive material. However, the third electrode 732 and the hollow tube Shape, but is not limited thereto.

In the display device 700 according to another embodiment of the present invention, the second touch sensing device 730 can function as a bending member while transmitting tactile feedback to the touch input of the user. The bending member can support the display panel 110 to bend or fold about the bending member when the display panel 110 is bent. In addition, stress can be concentrated in the bending area BA and the reliability of the first contact sensing device 120 can be reduced. Therefore, in order to compensate the vibration characteristics of the first contact sensing element 120, a second contact sensing element 730 may be additionally disposed in the bending area BA. Also, the second contact sensing element 730 may be formed in the same shape as the bending member, and the function of the bending member may be performed simultaneously without separately arranging the bending member. Therefore, the display device 700 according to another embodiment of the present invention can simplify the process of disposing the bending member by forming the second contact sensing element 730 in the shape of the bending member, and the bending area BA ), There is an effect of giving an additional vibration effect.

1 to 7, one bending area BA is illustrated as having one bending area BA in the display devices 100, 200, 300, 400, 500, 600, and 700. However, BA) can be defined. In this case, the structure of the second touch sensing element 130, 230, 330, 430, 630, 730 illustrated in FIGS. 1 to 7 can be applied to all bending areas BA.

A display device according to various embodiments of the present invention can be described as follows.

A display device according to an embodiment of the present invention includes: a display panel including a display area having a bending area; a first touch sensing element that overlaps a display area of the display panel and includes a first electroactive layer; And a second contact sensitive element including a bending member overlapping at least a bending region and a second electrically active layer covering the bending member.

According to another aspect of the present invention, the bending member may include a pillar portion overlapping the bending region.

According to another aspect of the present invention, the pillar portion is made of an insulating material, and the second touch sensitive element further includes a third electrode surrounding the pillar portion and a fourth electrode surrounding the second electric active layer, The active layer may surround the third electrode.

According to another aspect of the present invention, the pillar portion may be formed of a conductive material, the second electroactive layer may surround the pillar portion, and the second contact sensitive element may further include a fourth electrode surrounding the second electroactive layer.

According to still another aspect of the present invention, the bending member may further include a support portion disposed on both sides of the column portion and overlapping at least a partial region of the display region.

According to another aspect of the present invention, the supporting portion can support the entire area of the display area.

According to another aspect of the present invention, the bending member may be made of an insulating material, and the second touch sensing device may further include at least one third electrode disposed between the bending member and the second electroactive layer.

According to another aspect of the present invention, the second touch sensing device may further include at least one fourth electrode disposed on the opposite side of the surface on which at least one third electrode is disposed.

According to another aspect of the present invention, the bending member is made of a conductive material, and the bending member is disposed on one surface of the second electroactive layer and functions as a third electrode of the second touch sensitive element, And one or more fourth electrodes disposed on the other surface of the second electroactive layer.

According to still another aspect of the present invention, a first touch sensing element is disposed between a display panel and a second touch sensing element, and the bending element functions as a second electrode of the first touch sensing element in contact with one surface of the first electroactive layer And the first touch sensing element may further include at least one first electrode disposed on the other surface of the first electroactive layer.

According to another aspect of the present invention, the first touch sensitive element is disposed between the display panel and the second touch sensitive element, and the first touch sensitive element and the second touch sensitive element can share the bending member as the common electrode .

According to still another aspect of the present invention, the first contact-sensitive element further includes a plurality of first electrodes disposed on the other surface of one surface of the first electroactive layer to which the bending member contacts, and the second contact- The plurality of first electrodes of the first touch sensing element and the plurality of fourth electrodes of the second touch sensing element further include a plurality of fourth electrodes disposed on the other surface of one surface of the second electroactive layer, The same voltage can be applied.

According to another aspect of the present invention, the first touch sensing element includes a plurality of first electrodes disposed on one surface of the first electroactive layer and a plurality of second electrodes disposed on the other surface, A plurality of third electrodes disposed on one surface of the second active electrode and a plurality of fourth electrodes disposed on the other surface, wherein the plurality of first electrodes of the first touch sensing element and the plurality of third electrodes The electrodes corresponding to one another among the plurality of second electrodes of the first touch sensing element and the plurality of fourth electrodes of the second touch sensing element may be applied with the same voltage.

A display device according to another embodiment of the present invention includes a display panel including a display area having a bending area, a first touch sensing element overlapping the display area, and a bending area below the display panel, And a second contact-sensitive element including a hollow-tube-shaped bending member.

According to another aspect of the present invention, there is further provided an insulating layer disposed between the display panel and the second touch sensitive element, and the first touch sensitive element may be disposed between the display panel and the insulating layer.

According to another aspect of the present invention, the second touch sensing element may further include a third electrode surrounding the inner circumferential surface of the bending member, and a fourth electrode surrounding the outer circumferential surface of the bending member.

According to another aspect of the present invention, the interior of the bending member may be filled with the same conductive material as the third electrode.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100, 200, 300, 400, 500, 600, 700: Display device
110: Display panel
120, 520: first contact sensitive device
121: first electroactive layer
122: first electrode
123: second electrode
130, 230, 330, 430, 630, 730: a second contact-
131, 331, 631, 731: the second electroactive layer
132, 332, 632, 732: a third electrode
133, 333, 633, 733: the fourth electrode
151: Insulation layer
340, 440, 640: a bending member
141, 241, 441:
342, 442, 642:
BA: Bending area
AA: display area

Claims (17)

A display panel including a display area having a bending area;
A first touch sensing element overlapping a display area of the display panel and including a first electroactive layer;
A bending member disposed under the display panel and overlapping at least the bending region; And
And a second contact-sensitive element including a second electroactive layer covering the bending member. The method according to claim 1,
And the bending member includes a pillar portion overlapping the bending region. 3. The method of claim 2,
Wherein the column portion is made of an insulating material,
Wherein the second contact-
A third electrode surrounding the column portion; And
And a fourth electrode surrounding the second electroactive layer,
And the second electroactive layer surrounds the third electrode. 3. The method of claim 2,
Wherein the column portion is made of a conductive material,
And the second electroactive layer surrounds the pillar portion,
And the second touch sensing element further comprises a fourth electrode surrounding the second electroactive layer. 3. The method of claim 2,
The bending member
And a support portion disposed on both sides of the column portion and overlapping at least a part of the display region. 6. The method of claim 5,
And the supporting portion supports the entire area of the display area. 6. The method of claim 5,
Wherein the bending member is made of an insulating material,
And the second touch sensing element further comprises at least one third electrode disposed between the bending member and the second electroactive layer. 8. The method of claim 7,
Wherein the second touch sensing element further comprises at least one fourth electrode disposed on the opposite side of the surface on which the at least one third electrode is disposed. 6. The method of claim 5,
Wherein the bending member is made of a conductive material,
Wherein the bending member is disposed on one surface of the second electroactive layer and functions as a third electrode of the second contact sensitive element,
And the second touch sensing element further comprises at least one fourth electrode disposed on the other surface of the second electroactive layer. 10. The method of claim 9,
Wherein the first touch sensing element is disposed between the display panel and the second touch sensing element,
Wherein the bending member functions as a second electrode of the first touch sensing element in contact with one surface of the first electroactive layer,
Wherein the first touch sensing element further comprises at least one first electrode disposed on the other surface of the first electroactive layer. The method according to claim 1,
Wherein the first touch sensing element is disposed between the display panel and the second touch sensing element,
Wherein the first contact sensing element and the second contact sensing element share the bending member as a common electrode. 12. The method of claim 11,
Wherein the first contact sensing element further comprises a plurality of first electrodes disposed on the other surface of one surface of the first electroactive layer to which the bending member contacts,
Wherein the second contact sensing element further comprises a plurality of fourth electrodes disposed on the other surface of one surface of the second electroactive layer to which the bending member contacts,
Wherein a plurality of first electrodes of the first touch sensing element and a plurality of fourth electrodes of the second touch sensing element are applied with the same voltage. The method according to claim 1,
Wherein the first contact sensing element includes a plurality of first electrodes disposed on one surface of the first electroactive layer and a plurality of second electrodes disposed on the other surface,
Wherein the second touch sensing element includes a plurality of third electrodes disposed on one surface of the second electroactive layer and a plurality of fourth electrodes disposed on the other surface,
Wherein a plurality of first electrodes of the first touch sensing element and a plurality of third electrodes of the second touch sensing element are applied with the same voltage,
Wherein a plurality of second electrodes of the first touch sensing element and a plurality of fourth electrodes of the second touch sensing element are applied with the same voltage. A display panel including a display area having a bending area;
A first contact sensing element overlapping the display area; And
And a second contact-sensitive element disposed in the lower portion of the display panel so as to correspond to the bending region and including a hollow tube-shaped bending member made of an electroactive polymer. 15. The method of claim 14,
And an insulating layer disposed between the display panel and the second touch sensing element,
And the first touch sensing element is disposed between the display panel and the insulating layer. 15. The method of claim 14,
The second contact-
A third electrode surrounding the inner circumferential surface of the bending member; And
And a fourth electrode surrounding the outer peripheral surface of the bending member. 17. The method of claim 16,
And the inside of the bending member is filled with the same conductive material as the third electrode.

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